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I don't know about those kits you're looking at, but the GB-Tech kit can just fit up to 475mm of inner barrel just inside the inner barrel, behind the holes of the flash hider. From directly in front, you may be able to see the end of the inner barrel just hiding inside.
If you don't mind the inner barrel going through the flash hider (and appearing inside the holes/notches in the sides of the flash hider), you can fit a 509mm inner barrel all the way up to the tip of the flash hider.
Again, I have no idea what the dimensions of the KA or G&P kits are.
Anyways, I just run a 590mm inner barrel all the way through mine and out the tip - covered with the suppressor.
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